www.pudn.com > WiMAX_Downlink_802.16e_Matlab.zip > channelestimation_LMMSE.m, change:2007-06-29,size:415b

function Hlmmse=channelestimation_LMMSE(P1,Pilot,trms,t_max,snr,Hp_Ls) 
 
%LMMSE信道估计算法准则 
N=length(P1); 
beta=17/9; % 仅仅对于16QAM 
Rhh=zeros(N,N); 
 
%  计算Rhh --频域信道矢量的自协方差矩阵 
for k=1:N 
    for l=1:N 
        Rhh(k,l)=(1-exp((-1)*t_max*((1/trms)+j*2*pi*(k-l)/N)))./(trms*(1-exp((-1)*t_max/trms))*((1/trms)+j*2*pi*(k-l)/N)); 
    end 
end 
 
Hlmmse=(Rhh*inv(Rhh+(beta/snr)*eye(N))*Hp_Ls')';